Pulley Diameters

Discussion in 'Heating / Cooling / AC' started by 6pk2goDemon, Jun 20, 2018.

  1. 6pk2goDemon

    6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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    Stick a fork in it -- F I X E D

    :D :D :D :D
     
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    • plumkrazee70

      plumkrazee70 Well-Known Member

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      Hooray! Just so we don't have to weed through 6 pages, what was the recipe that worked for you?
       
    • 6pk2goDemon

      6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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      Give me a few minutes & I'll summarize for you. Loading a few pictures too!!
       
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      • 6pk2goDemon

        6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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        Put almost 75 miles on the car this morning. A mix of mostly freeway & some surface street driving over a period of 2 1/2 hours. Temps never got above 205* & predominantly stayed between 195-200* :)

        AC was on the entire drive & plenty cold!!

        2018-07-10 001 (Small).JPG

        2018-07-10 002 (Small).JPG
         
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        • 6pk2goDemon

          6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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          5 3/4" water pump pulley

          7 1/4" crank pulley

          Those were the only changes made to the cooling system. Lots of time & work to line everything up, but worth it!

          I'm in business again :D WooHoo
           
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          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

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            Problem solved! I have a feeling your fix will help many here with the same issues. Great job there!
             
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            • 6pk2goDemon

              6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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              Thanks Mike. This has been a thorn for several years, but I just dealt with it. Turn AC off until the car cools down....ugh :BangHead:

              I don't remember reading much info about pulley diameters in the Heating & Cooling forum, but my gorgeous billet pulleys turned out to be the source of a perplexing problem. I'm not one to just throw $$ at my car & very well may have been able to fix it with a new radiator, but I wanted to try this 1st. 2 belts, $20 & some sweat equity. Done :D

              Hoping another member or 2 may benefit from my solution.....:)
               
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              • yellow rose

                yellow rose Doctor of Thinkology.

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                I keep saying it's all about the FLOW. You can't drive the pump at crank speed, or worse, slower.

                When I was in HS, I had the only MoPar. The Chevys were the worst. Almost every one of them had a 1:1 water pump drive. The simple fix was to find pulleys and speed up the pump. What I learned in the summer of 1980 I've never forgotten. Flow is the number 1 killer of cooling systems.
                 
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                • 6pk2goDemon

                  6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                  Where were you 5 pages ago? :D Lesson learned and I WILL remember....Thanks
                   
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                  • plumkrazee70

                    plumkrazee70 Well-Known Member

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                    What pump do you have? Standard AC water pump?
                     
                  • red67gts

                    red67gts FABO Gold Member FABO Gold Member

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                    took me a long time to determine the March pulleys were causing me problems and hated to take them off but didn't like seeing it get to 240 either. The pulley change and Contour fan setup fixed mine. Glad to hear you got it!
                     
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                    • 6pk2goDemon

                      6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                      Yes, standard AC water pump from Cardone that was installed 9-10 years ago. That was my next target if the pulley changes didn't fix the car.
                       
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                      • 6pk2goDemon

                        6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                        Thanks Joe!! Your early posts in this thread helped a bunch--Most appreciated too :thumbsup:

                        I know that sometimes the smallest change can make the biggest difference without just throwing
                        parts & $$ at it :)
                         
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                        • 4spdragtop

                          4spdragtop FABO Gold Member FABO Gold Member

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                          Nice job C! What were the original(problem) pulley diameters?
                           
                        • 6pk2goDemon

                          6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                          They were both 6 1/2" diameter billet aluminum pulleys. Looked really nice too. Chrome don't get 'ya home :)

                          2018-06-23 001.JPG
                           
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                          • 4spdragtop

                            4spdragtop FABO Gold Member FABO Gold Member

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                            "Chrome don't get ya home" lol!
                            Nice work, real world experience.
                            Thanks C.
                             
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                            • mopardude318

                              mopardude318 Well-Known Member

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                              Nice work C!

                              Now why in the damn heck doesn't the aftermarket make billet pulleys the same as factory? Why do they change the sizes?
                               
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                              • 6pk2goDemon

                                6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                                I think the billet pulleys are designed for maximum performance, not maximum cooling. Most people can sacrifice temps for better horsepower. I can't do that because of where I live....

                                Thanks :)
                                 
                              • mbaird

                                mbaird mbaird FABO Gold Member

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                                I have to say that I am surprised that overdriving the pump would have made that much difference.
                                This was a great experiment and a great learning excersize!
                                 
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                                • Rick Riffle

                                  Rick Riffle Member

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                                  I had asked previously, where can I purchase the pulleys that you used?
                                  Also, do you believe the solution was due to speeding up the water pump or turning the fan at a faster rate? I ask because I am using an electric fan set up, so I am trying to determine if speeding up the water pump will help me or not.
                                   
                                • yellow rose

                                  yellow rose Doctor of Thinkology.

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                                  Water pump speed it critical. Once you are moving 15-20 MPH the fan is actually in the way. It's all about the FLOW.
                                   
                                • Howard1784

                                  Howard1784 Well-Known Member

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                                  Please tell us what pulleys to look for!!!
                                   
                                • 6pk2goDemon

                                  6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                                  Me TOO!! But it does make sense...

                                  There was enough improvement with the 1st change--water pump pulley only that it made sense to overdrive the water pump & fan additionally with the 2nd crank pulley change.

                                  Thanks for your input. :)
                                   
                                • 6pk2goDemon

                                  6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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                                  Sorry I missed your previous post. Pulley info below...

                                  Both pulleys used were original Mopar pulleys.

                                  The 5 3/4" water pump pulley is from a 64 273 V-8 car with AC.

                                  The 7 1/4" crank pulley was original to my 340 non AC car as far as I remember.
                                   
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                                  • Rick Riffle

                                    Rick Riffle Member

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                                    Perfect - Thanks for your help. Glad it worked for you.